Formula help please

[Drock74]

I have a sheet containing currency in cell E10, quantity F10 and a sum in M10 (=F10*E10) In cell K10 I also use multiple words that would equal a dollar or percent discount. I would like to write a formula that would apply the discount to cell M10 if cell k10 contains one of the 4 words. example of words are Welcome21, Welcome22 and Welcome23 all equal $10 off the sum in cell M10 and Thanks10 equals 10% off the sum in cell M10

 

[awoohaw]

Book3
	E	F	G	H	I	J	K	L	M	N
2	Currency	Quantity						Words	Sum	Net of Discount
3	$110.25	14						Welcome23	$1,543.50	$1,533.50
4	$110.25	14							$1,543.50	$1,543.50
5	$110.25	14						Thanks10	$1,543.50	$1,389.15
6
Sheet1

Cell Formulas
Range	Formula
M3:M5	M3	=F3*E3
N3:N4	N3	=IF(ISNUMBER(FIND("Welcome",L3,1)),M3-10, IF(ISNUMBER(FIND("Thanks",L3,1)),M3*0.1,M3))
N5	N5	=IF(ISNUMBER(FIND("Welcome",L5,1)),M5-10, IF(ISNUMBER(FIND("Thanks",L5,1)),M5*(1-0.1),M5))